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Impact of large cutoff-effects on algorithms for improved Wilson fermions

2004; Elsevier BV; Volume: 165; Issue: 1 Linguagem: Inglês

10.1016/j.cpc.2004.09.009

1879-2944

Michele Della Morte, Roland Hoffmann, Francesco Knechtli, Ulli Wolff,

Theoretical and Computational Physics

As a feasibility study for a scaling test we investigate the behavior of algorithms for dynamical fermions in the N_f=2 Schroedinger functional at an intermediate volume of 1 fm^4. Simulations were performed using HMC with two pseudo-fermions and PHMC at lattice spacings of approximately 0.1 and 0.07 fm. We show that some algorithmic problems are due to large cutoff-effects in the spectrum of the improved Wilson-Dirac operator and disappear at the smaller lattice spacing. The problems discussed here are not expected to be specific to the Schroedinger functional.